Fatigue Characteristic of RC Beams Strengthen with CFRP Strand sheet B4 Junpei Kasai Today’s Topic ・Background & Purpose ・Experiment & Result ・Future plan Background & Purpose Static behavior clear Fatigue behavior unclear To make fatigue behavior clear To analyze residual strength after 2milion fatigue load Experiment & Result ・Specimen Maximum load 90kN Minimum load 10kN Experiment & Result Figure of Crack Experiment & Result Figure of Crack Experiment & Result ・Failure model １layer Bending failure Maximum load 250kN Debonding occur at end of sheet ２layer Bending failure Maximum load 260kN Debonding occur at end of sheet Experiment & Result Load-displacement at loading point of 1 layer 350 Load（KN) 300 250 1 100 200 150 1,000 10,000 100,000 1milion 100 50 0 0 5 10 displacement（mm) 15 2milion static 20 Experiment & Result Load-displacement at loading point of 1 2ayer 350 300 1 100 1,000 10,000 100,000 1milion 2milion static Load（KN) 250 200 150 100 50 0 0 5 10 displacement(mm) 15 20 Experiment & Result Maximum load Static After fatigue 1layer 278kN 250kN 2layers 315kN 260kN Enough residual strength Experiment & Result Strain of sheet 1layer strain（μｍ） 2000 1 1500 100 1,000 1000 10,000 500 100,000 1milion 0 0 10 20 30 40 50 60 2milion 70 Distance from supporting point（ｃｍ） 2layers strain（μｍ） 2000 1500 1 100 1000 1,000 10,000 100,000 500 1milion 2milion 0 0 10 20 30 40 50 Distance from the supporting point（ｃｍ） 60 70 Experiment & Result Strain of sheet The number of loads increase Strain of sheet increase Strain of sheet 1layer＞2layer Experiment & Result Bond stress of sheet Stress（N/mm) 2.5 2 1.5 1 0.5 0 -0.5 0 1 100 10 20 30 40 50 60 1,000 70 10,000 -1 -1.5 100,000 1milion Distance from the supporting point（ｃｍ） 2milion Stress（N/mm) 2.5 2 1.5 1 0.5 0 -0.5 0 -1 1 100 1,000 10 20 30 40 50 60 10,000 70 100,000 1milion -1.5 -2 -2.5 2milion Distance from the supporting point（ｃｍ） Experiment & Result Bond stress of sheet 1layer＞2layers Sheet debonding Bond stress move Future plan ～ 2009 Dec 24 Static test 2009 Dec 25 ～ Analysis & Thesis Thank you for your kind attention !!
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